Nose
Spine
Feet
Mouth
Small fish
Sea cucumbers
Algae
Other sea urchins
Intertidal area only
Subtidal area only
Both intertidal area and subtidal areas
On the beach
Porcupine
Pentamerous
Toothpick
Dome
Strongylocentrotus
Purpuratus
Animalia
Echinoderms
Because a sea urchin's egg is relatively big
Because sea urchins have large numbers of eggs
Because the eggs make great omlettes
Because sea urchins have large numbers of relatively big eggs